预应力钢绞线网加固混凝土圆柱的轴压性能

发布时间：2018-05-13 16:24

本文选题：预应力高强钢绞线 + 混凝土柱　；参考：《工程力学》2014年03期

【摘要】：开发了一种预应力钢绞线(钢丝绳)网加固混凝土柱新技术,对24根预应力加固混凝土圆柱和2根未加固对比柱进行了试验,研究在单调轴向荷载作用下,钢绞线间距、预应力水平对混凝土柱加固效果的影响。试验结果表明:较对比柱,预应力加固柱的轴向峰值应力和应变最大提高幅度为83%和95%,加固效果随预应力水平的提高而提高;随钢绞线间距的减小,加固效果大幅度提高;钢绞线间距对加固效果的影响大于预应力水平的影响。建立了预应力钢绞线加固混凝土柱峰值应力和应变计算式,提出了两种应力-应变全曲线关系模型,计算结果与试验吻合良好,可为相关研究提供理论支持。预应力钢绞线网加固混凝土柱技术是一种主动、高效、无损加固新技术,具有推广和应用价值。
[Abstract]:A new technique of strengthening concrete columns with prestressed steel strand (wire rope) net is developed. The experimental results of 24 prestressed reinforced concrete columns and 2 unstrengthened contrast columns are carried out. The distance between steel strands under monotone axial load is studied. The influence of prestress level on reinforcement effect of concrete column. The experimental results show that the axial peak stress and strain of prestressed reinforced columns increase by 83% and 95%, and the reinforcement effect increases with the increase of prestress level, and the reinforcement effect increases greatly with the decrease of the distance between steel strands, and the maximum axial peak stress and strain of prestressed columns are increased by 83% and 95%, respectively. The effect of steel strand spacing on reinforcement effect is greater than that on prestress level. The formula of peak stress and strain of prestressed steel strand reinforced concrete column is established. Two kinds of stress-strain full curve relation models are proposed. The calculated results are in good agreement with the test, which can provide theoretical support for related research. The technique of strengthening concrete column with prestressed steel wire mesh is a new technique of active, high efficiency and nondestructive reinforcement, which has the value of popularization and application.
【作者单位】：北京工业大学城市与工程安全减灾省部共建教育部重点实验室;北京环友建筑技术发展有限责任公司;
【分类号】：TU378.3

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